US2580429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic structure of silica on alumina-coated porcelain
Assignee: HOUDRY
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Filing: 1949-09-23
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Granted: 1952-01-01
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Expires: 1969-09-23
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Houdry
- 👤 James W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; B01J37/00; B01J37/02; B01J37/024
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
THE PROCESS OF MANUFACTURING A CATALYST STRUCTURE WHICH COMPRISES ADDING FINELY DIVIDED ALUMINA TO A SATURATED SOLUTION OF ALUMINUM NITRATED AND GRINDING TO PRODUCE A HETEROGENEOUS SOLUTION OF ALUMINUM NITRATE AND FINELY DIVIDED ALUMINA, APPLYING SAID SOLUTION TO A FILM SUPPORT OF CATALYTICALLY INERT PORCELAIN, SUBJECTING THE COATED PORCELAIN TO THE TEMPERATURE REQUIRED TO LEAVE ON THE PORCELAIN SUPPORT A FILM OF ACTIVE ALUMINA, APPLYING TO THE ALUMINA FILM-COATED PORECELAIN SUPPORT AN ORGANIC COMPOUND CONTAINING SILICA UNTIL THE ALUMINA IS SATURATED, DRAINING OFF EXCESS LIQUID, HEATING THE SILICA-IMPREGNATED ALUMINA FILM TO THE RELATIVELY LOW TEMPERATURE REQUIRED TO REMOVE THE MOISTURE, HEATING THE SILICA-IMPREGNATED ALUMINA FILM IN AN OXIDIZING ATMOSPHERE TO THE TEMPERATURE REQUIRED TO DECOMPOSE THE ORGANIC SILICATE AND PERMIT THE SILICA TO REACT WITH THE ALUMINA, AND REPEATING THE OPERATION UNTIL THE RATIO OF SILICA TO ALUMINA IS BETWEEN 1:10 AND 1:2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |